@article{DAN_1983_273_5_a4,
     author = {V. A. Il'in},
     title = {Unconditional basis property on a closed interval of systems of},
     journal = {Doklady Akademii Nauk},
     pages = {1048--1053},
     publisher = {mathdoc},
     volume = {273},
     number = {5},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_5_a4/}
}